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AS3258xTom Japan

JapanRegistryRIPE NCCTypeEyeball

As of 26th September 2026, AS3258 (xTom Japan), an access network registered in Japan with RIPE NCC, originates 131 IPv4 prefixes covering 35.1k addresses and 26 IPv6 prefixes. By IPv4 address space that makes it the 5,233rd-largest of the 79,516 networks we see originating IPv4, and the 209th-largest of 729 in Japan. It is seen behind 12 upstream networks, most often AS137409 (GSL Networks Pty LTD) and AS17676 (SoftBank Corp.), and in front of 6 downstream networks. Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

131

IPv6 prefixes

26

IPv4 addresses

35.1k

IPv6 /64s

34.4B

Upstream graph

The networks AS3258 is seen behind, one and two hops out, drawn from real AS paths.

AS3258Toward the internet core
Upstream graph for AS3258: 11 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS3258xTom JapanThis networkAS2497Internet Initiati…AS6939Hurricane Electri…AS17676SoftBank Corp.AS18106Viewqwest Pte LtdAS137409GSL Networks Pty …AS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS20130Depaul UniversityAS215859Hetzner Cloud - S…AS8529Zain Omantel Inte…AS32590Valve Corporation

Networks observed one and two hops upstream of AS3258 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

55

adjacent networks

Upstreams
1222%
Peers
3767%
Downstreams
611%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS3258
NetworkCountryRelationshipPathsVantage pts
AS137409GSL Networks Pty LTDAUPeer6,917135
AS17676SoftBank Corp.JPPeer2,55476
AS2497Internet Initiative Japan Inc.JPPeer1,70960
AS6939Hurricane Electric LLCUSPeer57214
AS18106Viewqwest Pte LtdSGPeer3054
AS49544i3D.net B.VNLPeer1622
AS9002RETN LimitedGBPeer1622
AS35280F5 Networks SARLFRPeer1612
AS4775Globe TelecomsPHPeer1592
AS8966Etisalat (E&)AEPeer1322

Prefixes

All 157

The largest blocks AS3258 originates, widest first.

Largest prefixes originated by AS3258
PrefixAddressesVisibility
193.32.148.0/221k81/81
36.50.84.0/2351281/81
103.53.80.0/2351281/81
172.93.220.0/2351281/81
43.239.249.0/2425681/81
45.8.112.0/2425681/81
45.8.113.0/2425681/81
45.8.114.0/2425680/81
45.8.222.0/2425681/81
45.11.44.0/2425681/81

Routing health

How AS3258's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid100.0%157
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%157
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 131 prefixes

IPv6 — 26 prefixes

  • /324.3B × /6430.8%8
  • /4016.8M × /643.8%1
  • /4865.5k × /6465.4%17

Recent changes

Announcements that started or stopped since 28th Aug 2026.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.